KDL-40EX720 horizontal thin lines that appear on screen after 10 minutes of turning on the TV

Hi, I have a KDL-40EX720 that is showing Horizontal Thin Lines on screen after around 10 minutes of turning on the TV (that is when TV is warm), this incident occured after three years of purchasing the TV so it is not covered anymore by the warranty policy or terms.
These thin lines are too many and very thin that seems that screen is partially showing blurred images, this means that my TV screen is split into a part that is like 80% of the screen and covered with these blurring thin lines while the 20% of the screen is still showing normal picture.
I tried several sources of input, to confirm that problem is not only from HDMI, but in all cases it is showing the same, even when you press on the menu button, the display is also affected by these lines.
I sent the TV to Sony Repair and Maintenance Center in my county Lebanon. They said that problem can be in T-CON board that is inside the TV screen, and they also said this board can't be replaced because it is built-in with the screen. Also they can't repair it.
They said that screen need to be replaced, but it will cost me around 600$ that is equal to the price of a new KDL-40W600.
It is obvious that my TV has a faulty component, and I need community support in letting me know what could be the cause of these horizontal thin lines, and if really T-CON board in KDL-40X720 can't be replaced or repaired.
 Thanks in Adcance.  

Please see the other topics in this forum related to your question.
http://discussions.apple.com/thread.jspa?threadID=967815

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